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½(10p-7q) if p=9 and q=2

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(1)/(2)(10p-7q)

Evaluate the expression for p = 9 and q = 2:


\begin{gathered} (1)/(2)(10(9)-7(2)) \\ (1)/(2)(90-14) \\ (1)/(2)(76)=38 \\ \end{gathered}

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